Effets à court terme de la disponibilité de nourriture, de la température et de la remise en suspension des sédiments sur les indices biochimiques de croissance du Mya arenaria (L.): une étude en milieu naturel

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Abstract
The purpose of this study was to assess the short-term variability of the biochemical indices of growth protein:DNA, protein:RNA, and RNA:DNA ratios, in Mya arenaria (L.) and to evaluate the short-term effects of some environmental factors on these indices. The RNA:DNA and protein:DNA ratios of the digestive gland were positively correlated with the resuspension of benthic organic matter and sedimentation of organic particles in the water column, respectively. The RNA:DNA ratio of the gills was also positively correlated with resuspension. Resuspended benthic organic material is suggested to provide an appreciable source of food for Mya arenaria, which would supplement the generally low contribution from sedimentation. Sediment temperature did not affect the tissue indices studied. This suggests that the physiological responses of intertidal animals tend to be independent of short-term temperature variations. The biochemical indices of the adductor muscle did not respond to any of the studied environmental parameters.

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